Molding-machine.



No. 864,431. PATBNTBD AUG. 27, 1907.

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MOLDING MACHINE.

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PATENT oEEIoE.

AUGUST W. ROM, OF CHICAGO, ILLINOIS.

MOLDING-MACHINE.

Specification of Letters Patent.

Patented Aug. 27, 1907.

Application filed May 8,1905. Serial No. 259,267.

To all whom it may concern:

Be it known that I, AUGUST W. ROM, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented certain new and useful Improvements in Molding-Machines, ofwhich the following is a specification.

This invention relates more particularly to machines for making moldsfor circular castings such as pulleys, wheels or the like and isparticularly adapted for making molds for casting grooved sheaves. Itsobjects are to provide a machine of this character which will accuratelyand rapidly form the grooved portion of the mold, so that much lesslabor will be required than in known hmethods'of making such molds. i

Other objects and general and specific novel features will be pointedout in the following description, in which reference is made to theaccompanying drawings.

Figure l represents a sectional elevation of a machine embodying thisinvention. Fig. 2 is a detail showing an edge view of the forming tool.Fig. 3 is a detail showing the tool feeding device, and, Fig. 4 is a topplan view of a portion of the feed mechanism.

As shown in Fig. l, a suitable frame is provided, which consists of atop plate 5, legs 6 and spider brace 7. i A flask 8, in which the moldis to be formed, is supported on the 4top plate or table 5. A `centralvertical shaft 9 is supported in a socket 10 in the spider 7 and isprevented from turning by a set screw, or the like, 1l. A sleeve orquill l2 fits closely over the shaft 9 and rests'on the upper1 part ofthe socket 10. This sleeve is adapted to turn freely on the shaft 9, andis further supported by means of a bearing on arms 14 secured to adepending flange l5, around an opening I6 in the center of the table 5.The sleeve 12 is driven in any convenient manner, as by gear 17whichmeshes with a gear 18 on a counter-shaft 19 secured in suitablebearings 20 on the frame. This shaft is preferably driven by means of apulley or the like, 21.

Near the top of the sleeve l2 is clamped or fastened a horizontalbearing 22 which carries a tubular feed screw 23,y which is 'featheredto slide freely therein Without turning. This screw is fed forward bymeans of a nut 24 having projecting lingers or lugs 25, which areadapted to engage with a spring pressed pawl 26, pivoted at 27, to acollar 2S rigidly fastened to the shaft 9. This pawl is held in normalposition by means of the spring 29 which extends between an arm 30conbracket or support 34 to which is adjustably secured the forming tool35, by means of bolts 36 which enter ,into slotted holes in saidsupport. i

The forming tool may be made in any desired manner and the forming partshaped to correspond with the desired mold to be made. In this instance,I have shown the forming tool as a plate, preferably of steel, havingits lower outer edge provided with serrations 37 corresponding to thegrooves to be formed in the mold, for the grooved periphery of a sheave.

Adjacent to the forming tool is a scraper 38 which is adapted to gatherthe loosened material and carry it to the opening 16 in the center ofthe table 5 Where it is discharged down onto the floor, the gears beingprotected by means of a hood 39.

The operation of this machine is as follows. The material for the mold,preferably green sand, is rammed in the ordinary manner around on theinner side of the iask 8 until a suitable thickness is provided in Whichthe grooves are to be formed. The forming tool is then set with itsouter edge close to the inner wall of the sand and the stop collar 32set for the proper diameter of the sheave to be formed. The machine isthen started with the forming tool rotating in the direction of thehands of the clock, and at each revolution the nut 24 is turned onetooth or space. as the projecting lingers 25 come in Contact with thepawl 26. In the meantime, the scraper 38 carries away the dislodged sandor material as the forming tool gradually works the grooves into theface of the mold. When the stop 32 comes into contact with the bearing22, the nut can turn no farther and the fingers 25 strikingagainst thepawl 26, simply raise the latter against the tension of the spring 29.The outer portion of the mold being formed in this manner, the innerportion may be made in any Well known manner and the two set together toform a complete mold for the sheave.

It Will be noted that other material, such as loam may also be used forforming the molds, and various changes in the details of constructionand manner of driving this machine will readily suggest themselves ascoming Within the lscopeof my invention, and I do not wish to limitmyself to the-exact construction herein set forth, but

What I claim and desire to secure by Letters Patent is:

l` In a molding machine, the combination of a frame, a table on saidframe, a vertical shaft mounted in said frame, a sleeve mounted on saidshaft, means for driving said sleeve, a bearing on said sleeve, ahorizontal shaft carried in said bearing, a forming tool carried by saidhorizontal shaft, and means for feeding said shaft forward to presentthe tool to the face of the mold to be formed.

2. In a molding machine, the combination of a table, a shaft mountedvertically of said table, a sleeve rotatably secured on said shaft,means forrotating said sleeve, a bearing carried by said sleeve, a feedscrew carried in said bearing, a shaft adjustabiy secured in said feedscrew, a forming tool carried by said last mentioned shaft, a stop onsaid feed screw, a feed nut on said screw, and means for turning saidnut.

3. The combination of a frame, a table mounted on said frame, a shaftsecurely fixed centrally of said frame, a sleeve rotatably mounted onsaid shaft, a gear on said sleeve, a counter-shaft, a gear on saidcounter-shaft meshing with said first-named gear, means for driving`said counter-shaft, a bearing Secured to said sleeve, a cylindricalfeed screw sldably mounted in said bearing, a shaft' t adjustabiysecured in said feed screw, a nut on said feed screw, provided withprojecting ngers, a collar secured to said vertical shaft, a yieldingpawl pivoted 'on said co1- lar andradapted to engage with the fingers ofsaid feed screw, and a forming tool secured to the shaft in said feedscrew.

AUGUST W. ROM.

Witnesses B. C. BEAN, RALPH E. NOBLE.

